If triangle abc is equals to triangle mno then what corresponding angle is congruent to angle n

the first one is M  then it's N

i hope this helps

what is the original number? you forgot to add it.

check above link.

graphically?   well, you graph them both, the solutions is where they both intersect each other, since there are two solutions, meaning they will meet twice, or namely the linear will run into the quadratic curve twice, and where they meet, those x,y coordinates are the solutions to the system.